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(No Model.)

P. W. HEILMAN.

METAL HUB FOR LOOKS.

No. 337,494. Patented Mar. 9, 1886.

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NITED STATES PATENT OFFICE.

FREDERICK XV. HEILMAN, OF NEWARK, NEWV JERSEY, ASSIGNOR TO J AOOB LAGOW'ITZ, OF SAME PLACE.

METAL HUB FOR LOCKS.

SPECIFICATION forming part of Letters Patent No. 337,494, dated March 9, 1886.

Applicationfiled December 11, 1885. Serial No. 185,382. (No model.)

To all whom it may concern.-

Be it known that I, FREDERICK W. HEIL- MAN, of Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Metal Hubs for Locks, of which the following is a specification.

My invention relates to rotary key hubs or barrels for locks, and. particularly to that class of barrels which are adapted to receive flat keys; and the invention consists in a novel manner of constructing the same of sheet metal, as hereinafter specified.

In the drawings, Figures 1 and 2 are perspective views of the hub or barrel; Fig. 3, a view of the blank from which the hub is formed; Fig. 4, a view of the blank before being finally bent to form; Fig. 5, a top plan view of thehub; Figs. 6 and 7, horizontal and vertical sections, respectively, on the lines 9 y and a: m,- Fig. 8, a view of the hub in place.

I would state here that I am aware rotary hubs or barrels have been made from solid blocks of metal, that a barrel intended to receive an ordinary round-barreled key has been made of sheet metal, and that a sheet-metal hub for looks adapted to receive a flat key has also been proposed.

My improvedplan of manufacturing sheet metal hubs for fiat keys consists in first pun ching or cutting from sheet metal ablank of suitable form, then stamping or indenting to form annular enlargements or journals at each end, to prevent longitudinal movement of the hub or barrel within the lock, and bending or folding longitudinally along the middle to produce the key space or seat.

A indicates the blank from which the hub is made, the blank being cut or stamped out of any suitable material, preferably sheetbrass, and in the usual manner. The blank is then put into a die or former, and the journals or annular enlargements a made at the ends, and shoulders I) 0 formed immediately back of said journals. An annular enlargement, (1, is also formed next to thejournal a at the front end, the front walls of the enlargement (Z forming the shoulder b, just referred to. The annular enlargement (Z is larger than the journal a, and is of the same height as the main body 6 of the barrel, as shown in Figs. 7 and 8. After this is done the blank is bent longitudinally through the middle, as shown, so as to make the journals to and the enlargement d cylindrical.

It will be noticed that the journals a are connected by the main body 6, consisting of a flat portion, f, of U shape, whose inner faces, when the hub is bent to proper form, form the key seat or opening 9.

The shoulders I) c prevent any end movement of thehub or barrel within the look, but allow it to rotate freely therein upon the journals a.

The hub or barrel constructed as herein described is simple and cheap, and requires but two operations to produce it. In appearance it is scarcely distinguishable from the solid metal barrel when in the position in the look, but it is much cheaper to make. It possesses advantages over the sheet-metal hubs heretofore made in that the annular enlargements or journals a at each end may be made of any desired length, and are not dependent upon the thickness of material of which they are made, as heretofore; and,again. thehubis not as liable to become displaced as when the journals are formed oflaterally-bent lips.

The front annular enlargement or journal a is partially closed, as shown in Figs. 1, 4, and 5, by lips h, which are separated only a distance sufficient for the insertion of the key.

Having thus described my invention, what I claim is 1. A hub or barrel for a lock, consisting of a piece of sheet metal having its ends indented, as shown, and then bent or folded longitudinally through its middle to form thejournals a at its opposite ends, substantially as set forth.

2 A sheet-metal hub or barrel provided with a hollow cylindrical enlargement at each end.

3. A sheet-metal .hub or barrel provided 5 with annular journals at each end, and with an intermediate annular enlargement.

4. A sheet-metal hub or barrel provided with annular enlargements at each end extending in a plane parallel with its length.

5. A key barrel or hub consisting of the sheet-metal blank A, indented at each side of the middle and at each end, substantially as shown, and bent lengthwise through its middleto form the flat key-seat c and the cylindrical journals a.

FREDERICK WV. HEILMAN.

Witnesses:

ALEXANDER O. FRANKEL, MoRRIs EPsTEIN. 

